Manholeseals for steamboilers are conventionally sealed with usually oval seals, made from multi layered graphite, reinforced with steelplates. The sealing of the manhole has to be guaranteed both in the high pressure during the operational period and the pressure reduction phase (starting and stopping). Sealing problems usually occur in the lower pressure phase, as the seals are maily executed for the high pressure phase with a relativ large sealsurface to ensure no overload happens. At a fall of the pressure, which works pressure supporting, usually the minimal planography is not reached and the seal is pushed out of its enclosure. The KSD principle uses therefore seals with a small width according to the carrier principle. The carrier prevents an overpressure on the sealing material in the high pressure phase. As the sealing material is housed in an H-profile it is blow-out proof. The soft sealing material has a stainless steel lining for the stability of the seal. Spring tensioned mounting ensures the correct pre-tension in the lower pressure phase.
Thus a secure, stabil and long lasting sealing system has been created, offering the user more safety and an overal cost reduction.
